Fiwix is an operating system kernel based on the Unix architecture and fully focused on being Linux compatible. It is designed exclusively for educational purposes, so the kernel code is kept as simple as possible for the benefit of students. It runs on the 32-bit x86 hardware platform, and is compatible with a good base of existing GNU applications.

Keepalived for LVS aims to add a strong and robust keepalive facility to the Linux Virtual Server project. This project is written in C with multilayer TCP/IP stack checks. It implements a framework based on three family checks: Layer3, Layer4, and Layer5. This framework gives the daemon the ability of checking a LVS server pool states.When one of the servers in the LVS server pool is down, keepalived informs the Linux kernel via a setsockopt call to remove this server entry from the LVS topology. In addition, it implements a VRRPv2 stack to handle director failover.

Kernel Mode Linux is a technology which enables
the execution of user programs in a kernel mode.
In Kernel Mode Linux, user programs can access
kernel address space directly. Unlike kernel
modules, user programs are executed as ordinary
processes (except for their privilege level), so
scheduling and paging are performed as usual.
Although it seems dangerous, the safety of the
kernel can be ensured through such methods as
static type checking, software fault isolation,
and so forth.

Linux is a clone of the Unix kernel, written from scratch by Linus Torvalds with assistance from a loosely-knit team of hackers across the Net. It aims towards POSIX and Single UNIX Specification compliance. It has all the features you would expect in a modern fully-fledged Unix kernel, including true multitasking, virtual memory, shared libraries, demand loading, shared copy-on-write executables, proper memory management, and TCP/IP networking.

amforth is an extendible command interpreter for the Atmel AVR ATmega microcontroller family. It has a turnkey feature for embedded use as well. It does not depend on a host application. The command language is an almost compatible ANS94 forth with extensions. It needs less than 8KB code memory for the base system. It is written in assembly language and forth itself.

rt_com provides an easy interface to the serial port hardware from real-time
contexts. It provides all needed functionality to communicate with electronic
equipment along standard serial lines. It works with different flavors of
RT-Linux and RTAI.

Astaro Portscan Detection is a netfilter target which will attempt to detect TCP and UDP port scans and log them to syslog. This target is based upon Solar Designer's scanlogd. It suppports mutliple levels of logging, custom prefixes for entries, weighted total port scan detection, and port scan temporal spread detection.

ADQ is a project that aims to provide device drivers
and a terminal based data acquisition and control
program for the Meilhaus ME26 data acquisition
board, and the Meilhaus ME53 relay boards. The
data can also be displayed in real time with a Web
page.

KOS (Kid Operating System) is an educational
development project of an operating system for
computers based on the IA32 architecture. It is
modular (run-time dynamic linking), and supports
preemptive multitasking.